What the data for this category looks like
Satellite communications research report data comes primarily from publicly available technical documents from satellite operators, communications link analysis reports released by industry associations, and satellite orbital resource filing documents. Updates trigger when major events occur, including new satellite launches, frequency band adjustments, and link optimizations. Updates are completed within 1 to 3 days after the event. Documents combine structured and unstructured formats, including chaptered summaries and parameter tables for items such as satellite orbital altitude, bandwidth, and frequency bands. Fields include orbital altitude (unit: kilometers), communication bandwidth (unit: Mbps), and coverage area (unit: square kilometers). Individual documents can be tens of thousands of characters long.
Constraints on Knowledge Base Retrieval and Recall From These Characteristics
Multi-source data has inconsistent field formats. Some documents mix kilometers and meters for the orbital altitude parameter. Unit standardization processing must be completed before recall. Documents are long and dense with technical details. When performing segmented retrieval, balance must be struck between semantic completeness and context window limits. Update cycles are irregular. On-demand incremental synchronization must be supported. There is a strong requirement for unit matching for specific fields. User queries often carry unit keywords such as frequency bands and bandwidth. The recall logic must associate field units for precise matching. Newly released satellite technical data must be quickly added to the recall scope to ensure retrieval timeliness.
How to Set Configurations
| Configuration Item | Recommended Value | Rationale |
|---|---|---|
UPLOAD_FILE_MAX_SIZE | 500 MB | Satellite communications research reports often contain large amounts of ephemeris data, link test charts, and original test reports. Single-file volume is large, so this setting must accommodate large file upload requirements |
PARSE_FILE_TIMEOUT_SECONDS | 900 seconds | Long documents contain large amounts of technical details and tables. Parsing takes a long time. This setting avoids parsing failures caused by timeouts |
Segment Length | 800–1200 characters | Satellite research reports are dense with technical details. Segments that are too long will lose local semantic associations, while segments that are too short will damage the integrity of technical logic |
Recall Count | Top 8–10 results | Single research report has high information density. Too many recall results will exceed context window limits, while too few will fail to cover relevant technical parameters |
Similarity Threshold | 0.72–0.80 | Precise matching of technical parameters and scenario requirements is required. This avoids low-relevance general communications documents interfering with retrieval results |
hnsw.max_scan_tuples | 10000 | When the volume of satellite research report data is large, adjust the number of scanned tuples to balance recall accuracy and retrieval speed. This avoids configuration parameter errors |
The parameter values provided on this page are common starting points for configuration. Actual values are influenced by material form, data volume, and business rules. Each scenario requires individual analysis. It is recommended to test against your own samples before finalizing settings.
Three Common Configuration Mistakes
- Issue: An error
invalid configuration parameter name "hnsw.max_scan_tuples"appears when searching the knowledge base. Cause: The HNSW index configuration item is not enabled in the corresponding FastGPT version, or the parameter name is misspelled. - Issue: After upgrading from version 4.9.13 to 4.10.1, all content is visible on the knowledge base page, but the model prompts that the knowledge base is empty during conversations. Cause: Database migration did not synchronize vector index configuration, or vector database connection parameters were not updated for version compatibility.
- Issue: A call to the API for creating a new knowledge base directory returns a 400 status code. Cause: The request body does not include the correct
parentIdfield, or the directory name contains invalid characters.
How to Verify Configuration Is Correct
- Upload a standard research report that includes satellite orbital parameters, and confirm that the parsed segment length falls within the set
800–1200 charactersrange. - Submit a query that includes specific satellite frequency bands and bandwidth, and check that the number of recall results matches the set
Top 8–10 results. - Review system logs to confirm there are no configuration errors related to
hnsw.max_scan_tuples, and that vector database connection parameters are functioning normally. - Call the API for creating a new knowledge base directory, and verify that the returned status code is 200, and that the directory displays correctly on the knowledge base page.
Question material comes from public community discussions. Configuration values are common starting points and should be measured against your own samples. Verified on 2026-09-14.